Answer:
Only the Knights of Labor allowed unskilled workers to be members.
Step-by-step explanation:
The American Federation of Labor (AFL) and the Knights of Labor had different approaches to membership, and neither of the first two options in your question accurately represents their views.
The AFL allowed unskilled workers to be members: The AFL was a federation of trade unions that primarily represented skilled workers, and it focused on organizing workers by craft or trade. However, it did allow unskilled workers to join its member unions if they were part of the same trade or craft.
The Knights of Labor also allowed unskilled workers to be members: The Knights of Labor was a broader labor organization that aimed to include both skilled and unskilled workers. It was more inclusive than the AFL and welcomed workers from various trades and backgrounds into its ranks.